1. Newton’s Second Law

2. But First We Need to Know About Mass

3. Mass The quantity of matter in an object.
It is also the measure of the inertia
The resistance of an object in response to an effort to start it, stop it, or change its state of motion in any way

4. Weight Just the force upon an object due to gravity
Dependent on the force of gravity
Weight = mg
Where g is the constant of proportionality and has the value 9.8N/kg or 9.8m/s2

5. So on the moon…
Is your mass the same?
Is your weight the same?

6. An anvil in outer space may be weightless, but it is not massless

7. An astronaut in space would find that the weightless anvil just as difficult to shake as on Earth This is due to its mass (and inertia)

8. Mass Resists Acceleration
If you push your friend on a skateboard he/she will accelerate
If you push an elephant on a skateboard, the acceleration is much less
The amount of acceleration depends not only on the force, but the mass

9. Mass Resists Acceleration
The same force applied to twice the mass produces half the acceleration
So we say, for a given force, the acceleration produced is inversely proportional to the mass
Acceleration ~ 1/mass

10. Hey Guess What I Found!
NFL Physics

11. Newton’s Second Law of Motion
The acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object

12. The way your book wants you to know the equation for Newton’s Second Law
Acceleration = net force/mass
a=Fnet/m

13. Newton’s Second Law Equation

14. Newton’s Second Law
As the force acting upon an object is increased, the acceleration of the object is increased.
As the mass of an object is increased, the acceleration of the object is decreased.

15. How To Do 2nd Law Problems
Khan Academy Newton's Second Law

16. pg. 61 #21-26
pg. 62 Plug and Chug # 6-10